JP5191180B2 - Hygroscopic / deodorant sheet - Google Patents

Description

  The present invention relates to a hygroscopic / deodorant sheet. More specifically, a high hygroscopic property and an excellent deodorizing property are provided by sandwiching a large amount of a porous hygroscopic agent and an adsorbent. The present invention relates to a moisture absorbing / deodorizing sheet having excellent printability.

  Conventionally, in order to use a hygroscopic material (hereinafter referred to as a hygroscopic agent) mainly composed of silica gel, quicklime, calcium chloride or a mixture thereof as a humidity control, dehumidification or desiccant, a perforated polyethylene is laminated on paper or non-woven fabric. A bag-like material (Patent Document 1 and Patent Document 2) in which a hygroscopic agent is sealed inside a packaging material or a packaging material in which a reinforcing material such as a walliff is laminated for reinforcement has been proposed. On the other hand, a sheet-like material (Patent Document 3) in which two non-woven fabrics having heat-sealing properties are overlapped and a peripheral part and a central part thereof are joined in a lattice shape to store a desiccant is known.

In recent years, the demand for desiccant applications with a deodorizing function in addition to humidity conditioning and dehumidifying functions has expanded in various fields such as household goods, food, precision equipment, and housing. In order to adapt to various uses, a wide variety of bag-like materials are required. In addition, the above-described sheet-like material has some degree of flexibility, but there is a limit to use by cutting and deforming the shape into a free shape. For example, in the case of a dehumidifying / deodorizing sheet used for housing, there is a problem that the use location is limited unless the thickness of the dehumidifying / deodorizing sheet is uniform. In addition, when a fine particulate hygroscopic agent or deodorant is used to improve moisture absorption / deodorization performance, there is a problem that fine particles easily fall off the sheet when made into a sheet.
Furthermore, by making it into a sheet-like material, it becomes possible to cut into a free shape. For example, a sheet-like material in which a mixture of adsorbent powder and thermoplastic resin powder is sandwiched between two layers of sheets and integrated by pressure bonding Is known (Patent Document 4). However, this sheet-like material uses a nonwoven fabric alone as a packaging material, and therefore cannot be said to be sufficient in terms of surface smoothness, basis weight, and uniformity of thickness.

Japanese Utility Model Publication No. 44-20879 Japanese Utility Model Publication No. 58-60435 JP 2002-355498 A JP-A-5-49850

  The problem of the present invention is that the moisture absorption / deodorization sheet has moderate air permeability, no fine particulate porous moisture absorbent and adsorbent powder leakage, good surface printability, and various shapes. It is to provide a moisture absorbing / deodorizing sheet that can cope with the above.

  In view of the above-mentioned problems of the prior art, the present inventor uses a specific laminated nonwoven fabric having a fiber layer containing an ultrafine fiber layer and a low-melting-point component as a sheet material for a moisture absorption / deodorization sheet in at least one of upper and lower layers. The moisture absorbent / deodorant sheet integrated by thermal bonding, sandwiching fine particulate porous moisture absorbent, adsorbent and thermal adhesive resin particles in the middle, has an appropriate moisture absorption speed, smooth surface and It has been found that the thickness uniformity and flexibility are excellent, and the present invention has been completed.

That is, the present invention is as follows.
(1) Laminated nonwoven fabric comprising three layers of a thermoplastic synthetic fiber layer (A), an ultrafine fiber layer (B), and a thermoplastic synthetic fiber layer (C) having a lower melting point component than the thermoplastic synthetic fiber layer (A) In the hygroscopic / deodorant sheet having the layer and the other nonwoven fabric layer (D) integrated by thermal bonding on the surface of the thermoplastic synthetic fiber layer (C), the particle sizes of the porous hygroscopic agent and the adsorbent are both A hygroscopic / deodorant sheet having a structure of 1000 μm or less, wherein the porous moisture absorbent and the adsorbent are sandwiched between the thermoplastic synthetic fiber layer (C) and the nonwoven fabric layer (D).
(2) The moisture absorbent / deodorant sheet according to (1), wherein the other nonwoven fabric layer (D) is a nonwoven fabric layer comprising one layer or a laminated nonwoven fabric layer comprising a plurality of layers.
(3) The absolute amount of the porous agent combined with the porous moisture absorbent and the adsorbent is 50 to 1000 g / m ² , and the absolute amount of the adsorbent to be mixed is 10 to 500 g / m ^2. The moisture absorbing / deodorizing sheet according to (1) or (2) above.
(4) A porous agent in which the thermoplastic synthetic fiber layer (C) and the nonwoven fabric layer (D) are bonded using heat-bonding resin particles, and a porous moisture absorbent and an adsorbent for the heat-bonding resin particles are combined. The moisture absorption / deodorization sheet according to any one of the above (1) to (3), wherein the mixing ratio is from 1/2 to 2/1 by weight.
(5) The air permeability of the laminated nonwoven fabric composed of the three layers (A) to (C) is 1 to 250 cc / cm ² · sec, according to any one of the above (1) to (4), Moisture absorption and deodorant sheet.
(6) The thermal adhesive resin particles are a hot melt agent, the porous hygroscopic agent is silica gel, and the adsorbent is activated carbon, according to any one of (1) to (5) above Hygroscopic / deodorant sheet.
(7) The hygroscopic material as described in any one of (1) to (6) above, which has a printed layer on the front surface and / or the back surface of the laminated nonwoven fabric composed of the three layers (A) to (C). Deodorant sheet.
(8) The porous film according to any one of (1) to (7), wherein a porous film is combined and integrated on at least one side of the laminated nonwoven fabric composed of the three layers (A) to (C). Moisture absorption and deodorant sheet.
(9) The air permeability of the laminated nonwoven fabric composed of three layers (A) to (C) in which the perforated film is combined and integrated is 1 to 10000 seconds / 100 cc. Hygroscopic / deodorant sheet.
(10) A multilayer moisture-absorbing / deodorizing sheet, wherein a plurality of sheets are laminated by interposing a thermal adhesive resin layer in the moisture-absorbing / deodorizing sheet.
(11) A laminated nonwoven fabric comprising three layers of a thermoplastic synthetic fiber layer (A), an ultrafine fiber layer (B), and a thermoplastic synthetic fiber layer (C) having a lower melting point component than the thermoplastic synthetic fiber layer (A). A layer is formed, and on the surface of the thermoplastic synthetic fiber layer (C), thermal adhesive resin particles having a particle size of 1000 μm or less, a porous moisture absorbent and an adsorbent are sprayed, and another nonwoven fabric layer (D) (1), wherein the porous hygroscopic agent and the adsorbent are sandwiched between non-woven fabric layers by thermally bonding to the surface of the thermoplastic synthetic fiber layer (C), and laminating and integrating the two. Manufacturing method of moisture absorption and deodorant sheet.

  The hygroscopic / deodorant sheet of the present invention uses a fiber having good thermal adhesiveness in the nonwoven fabric layer serving as an adhesive surface, and further sandwiches a thermal adhesive resin, so that the adhesiveness of the sheet and the porous The fixing of the porous moisture absorbent and the adsorbent (hereinafter, the combination of the porous moisture absorbent and the adsorbent is referred to as the porous agent) to the sheet becomes strong, and the porous agent is hardly detached from the sheet. Furthermore, by having the ultrafine fiber layer in the sheet, even if the porous agent has a small particle diameter, powder leakage is eliminated.

In addition, it has moderate moisture absorption and deodorization speed according to the intended use without degrading the performance of the porous agent, the surface is smooth, the thickness is uniform, the integrity as a sheet, and the flexibility Since it is excellent, it becomes possible to cut the moisture absorbing / deodorizing sheet into a free shape according to the shape of use, and it can be used for a wide range of applications.

The present invention will be specifically described below.
The hygroscopic / deodorant sheet of the present invention comprises a thermoplastic synthetic fiber layer (A), an ultrafine fiber layer (B), and a thermoplastic synthetic fiber layer (C) having a lower melting point component than (A). Layered non-woven fabric and other non-woven fabric layer (D), in which thermal adhesive resin particles with a particle size of 1,000 μm or less, porous hygroscopic agent and adsorbent are sandwiched and integrated by thermal bonding It is.

The hygroscopic / deodorant sheet of the present invention can sandwich a porous agent with a large amount of particle size between the three-layer laminated nonwoven fabric and the other nonwoven fabric layers, so that it has a high hygroscopic performance with excellent moisture absorption. It has excellent deodorizing properties. Specifically, the absolute amount of the porous material is indicated by dry weight, 50 to 1000 g / ^{m 2} in dry weight, preferably 80~700g / ^{m 2,} more preferably 100~350g / ^{m 2.} When the porous agent is less than 50 g / m ² , the fixation to the nonwoven fabric becomes strong, but the hygroscopic property and the deodorizing property are small. On the other hand, if it exceeds 1000 g / m ² , the hygroscopic and deodorant effects are increased and the duration of hygroscopic and deodorant can be increased, but the fixation to the nonwoven fabric becomes weak, and the end face of the hygroscopic / deodorant sheet This causes a problem that the porous agent is easily removed.
In the present invention, the mixing amount of the adsorbent in the porous agent is preferably in the range of 10 to 500 g / m ² from the viewpoint of deodorizing performance, and the more preferable mixing amount is in the range of ^{20 to} 300 g / m ² . It is desirable that

The first feature of the present invention is that a fiber layer having excellent thermal adhesiveness is used for the adhesive surface in order to reinforce the adhesion and fixing of the porous agent to the sheet, and further the thermal adhesive resin particles are used as the adhesive layer (intermediate). The sheet is sandwiched and is a so-called hygroscopic / deodorant sheet in which adhesion is enhanced from both sides of a fiber excellent in thermal adhesiveness and thermal adhesive resin particles.
In other words, the laminated nonwoven fabric of three layers is at least one of the upper and lower layers, the (C) layer is used for the adhesive surface, the thermal adhesive resin particles and the porous moisture absorbent are sandwiched, and the heat is stably integrated by thermal bonding. The seal strength is obtained.

Specifically, by providing a difference in melting point between the (A) layer and the (C) layer, the thermal adhesive resin particles and the porous agent are sandwiched between the sheets and integrated by thermal bonding. By making the layer an adhesive surface, heat sealing processing between the adhesive surfaces is possible in a wide temperature range, and furthermore, the adhesive effect by the thermal adhesive resin particles existing in the middle can greatly contribute, and (C ) Processing at a temperature higher than the melting point of the layer fiber is possible, and (C) the layer fiber and the porous agent can be directly bonded. As a result, an extremely strong and stable heat seal strength and a sheet of the porous agent can be obtained. Can be achieved.
In the case of bonding with conventional thermal adhesive resin alone, in order to maintain the adhesive strength, there is a tendency to use a large amount of resin, and as a result, it becomes easier for the porous agent itself to cover the surface, moisture absorption and deodorization performance It is easy to cause the problem that falls.

  Therefore, it is possible to reduce the amount of the heat-adhesive resin particles used as compared with a case where a fiber layer having excellent heat adhesion is not used on the bonding surface. Specifically, it is preferable to bond the heat-bonding resin particles and the porous agent at a weight ratio of 1/2 to 2/1, more preferably 1 / 1.5-1 to 1.2. 5/1. The heat-adhesive synthetic fiber layer (C) acts effectively in terms of immobilization of the hygroscopic agent to the fibers, and the heat-adhesive resin particles can be said to contribute to the improvement of the peel strength between the sheets. .

The second feature of the present invention is that an ultrafine fiber layer is used as an intermediate layer of a three-layer laminated nonwoven fabric, so that even if fine thermal adhesive resin particles and a porous agent are sandwiched, both particles are prevented from leaking and falling off. it can. Furthermore, the ultrafine fiber layer has an action of appropriately filling the fiber gap formed by the relatively thick fibers of the layers (A) and (C), and by controlling the deposition amount of the ultrafine fiber layer, Appropriate control and breathability can be controlled, and appropriate moisture absorption speed and deodorization speed can be obtained.
That is, in the sheet material used in the present invention, the ultrafine fiber layer (B) is laminated and integrated between the thermoplastic synthetic fiber layer (A) and the thermoplastic synthetic fiber layer (C) having a low melting point component. As a result, the ultrafine fiber layer enters the fiber gap consisting of thick fibers and is laminated so as to cover the fiber gap, resulting in a laminated nonwoven fabric with extremely fine and uniform fiber gaps, and leakage of fine particles , Can prevent the particles from falling off.

  Furthermore, it is effective to provide an extra fine fiber layer to control the moisture absorption and deodorization speed of the porous agent, and it becomes possible to control the air permeability appropriately and to control the barrier.・ Deterioration in deodorization performance can be controlled, and it is possible to obtain mild and moderate moisture absorption / deodorization speed. Moreover, the moisture absorption and deodorization time can be controlled over a wide range, for example, by integrating the laminated nonwoven fabric and the perforated film and controlling the air flow rate so that the moisture absorption and deodorization performance of the porous agent can be maintained for a long time. be able to.

  Furthermore, when it is necessary to maintain the moisture absorption / deodorization performance of the porous agent for a long time, the laminated nonwoven fabric and the perforated film can be combined and integrated to control the air flow rate. As a result, the moisture absorption / deodorization sheet of the present invention can control the moisture absorption / deodorization time over a wider range.

  The third feature of the present invention is that the moisture absorbing / deodorizing sheet has a uniform basis weight and thickness, is excellent in flexibility, can be cut into shapes according to various uses, has a smooth surface, and is suitable for printing. It is excellent and has the effect of improving the designability. It can be said that these effects are derived from the structural characteristics of the sheet material of the present invention.

Hereinafter, specific embodiments of the moisture absorption / deodorization sheet of the present invention will be described.
In the laminated nonwoven fabric of the present invention, (A) layer is a thermoplastic synthetic fiber layer having a high melting point, (B) layer is an ultrafine fiber layer, and (C) layer is a heat having a melting point of 50 ° C. or more lower than the melting point of (A) layer fiber. A synthetic plastic fiber layer is laminated and integrated by thermocompression bonding, and can be said to be a kind of laminated nonwoven fabric having an S / M / S structure. Moreover, integrating with said thermocompression bonding means heating and crimping | bonding between an embossing roll and a smooth roll, and joining.

  The high-melting thermoplastic synthetic fiber layer (A) used in the present invention is usually composed of thick fibers having a fiber diameter of 10 to 30 μm, and is preferably excellent in strength and air permeability and has high wear strength. Examples of such constituent fibers include synthetic fibers such as polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolyester, and polyamide fibers such as nylon 6, nylon 66, and copolyamide fibers.

  The thermoplastic synthetic fiber layer of the (C) layer used in the present invention has a lower melting point than the fibers of the (A) layer, preferably from 30 to 160 ° C., more preferably from a low melting point fiber in the range of 50 to 130 ° C. And constitutes the heat bonding surface of the hygroscopic sheet. A thick fiber having a fiber diameter of 10 to 30 μm is preferable. Examples of the constituent fibers include olefin fibers such as low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene, and copolymer polypropylene, polyethylene terephthalate, phthalic acid, isophthalic acid, sebacic acid, adipic acid, diethylene glycol, 1,4 A synthetic fiber such as an aromatic polyester copolymer obtained by copolymerizing one or more compounds of butanediol, a polyester fiber such as an aliphatic polyester, and a copolymerized polyamide fiber is used.

Specifically, a composite fiber composed of two components having a low melting point component such as a core-sheath structure and side-by-side, for example, a composite fiber having a core portion having a high melting point and a sheath portion having a low melting point is preferable. For example, the core is a high melting point fiber such as polyethylene terephthalate (PET), polybutylene terephthalate, nylon 6, nylon 66, copolymer polyamide, and the sheath is low density polyethylene, high density polyethylene, polypropylene, copolymer polyethylene, copolymer. Low melting point fibers such as polymerized polypropylene, copolyester (CO-PET) and aliphatic polyester are preferred.

  The ultrafine fiber of the layer (B) of the present invention is usually a fiber by a melt blow method, and the fiber diameter is preferably 7 μm or less, more preferably 1 to 5 μm, the fiber gap and the maximum opening diameter are reduced, and the powder Has the role of reducing leakage. In particular, by laminating the (B) layer of ultrafine fibers so as to cover relatively large fiber gaps formed by thick fibers, the fiber gaps can be reduced with a small ultrafine fiber ratio. When the fiber diameter exceeds 7 μm, the effect of covering the fiber gap decreases.

The basis weight of the ultrafine fibers of the (B) layer is preferably 1 g / m ² or more, more preferably ^{2 to} 15 g / m ² , and further preferably 3 to 10 g / m ² .
The content ratio of the (B) layer to the laminated nonwoven fabric is 5 to 20 wt%, preferably 10 to 15 wt%. Examples of the melt blown fiber include polyolefin fibers such as polyethylene and polypropylene, polyamide fibers such as nylon 6 and nylon 66, polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, copolymerized polyester and aliphatic polyester, and composite fibers. Synthetic fibers such as component fibers are used.

The thermal adhesive resin particles and the porous agent used in the present invention have a particle size of 1000 μm or less, preferably 50 to 500 μm, more preferably 75 to 200 μm. In order to adjust the particle size, it can be classified using a sieving machine, the adsorbent is classified into 250 to 500 μm in particle size, the hygroscopic agent is classified into 75 to 200 μm in particle size, What was classified into 250-500 micrometers by the particle size as a heat bonding resin particle is preferable.
The thermal adhesive resin particles are preferably hot melt agents. The porous hygroscopic agent of the porous agent is preferably a hygroscopic agent that does not become liquid by adsorbing moisture, such as silica gel (A type, B type), alumina gel, silica alumina gel, natural zeolite, and synthetic zeolite. The adsorbent for the porous agent is preferably activated carbon, chelate resin, zeolite, ceramic or the like. These granular materials are sandwiched between the sheets and integrated by thermal bonding to obtain a moisture absorbing / deodorizing sheet.

  Examples of the hot melt agent used as the thermal adhesive resin particles of the present invention include EVA, EEA, LDPE, polyester, nylon, and the like, which are usually used in the processing of an adhesive interlining. Is used. The particle size of the hot melt agent powder is 1000 μm or less, preferably 40 to 500 μm. The MI (melt index) value representing the viscosity at the time of melting is 0.1 to 30, preferably 1 to 20. When the particle size of the hot melt agent is less than 40 μm, the hot melt agent easily floats in the air, and processing into a porous agent tends to be difficult. On the other hand, when the particle size exceeds 1000 μm, the secondary workability of the sheet-like material tends to be lowered.

In particular, it is preferable to classify the particle size ranges of the porous agent and the hot melt agent to the same extent in terms of powder mixing properties, heat bonding processability, and smoothness of the moisture absorbing / deodorizing sheet surface. In other words, equal pressure is applied to the powder hot melt agent and the porous agent during hot press bonding, and the porous agent powder is joined to the sheet only at the contact point between the sheet and the porous agent without changing the shape of both. Thus, a moisture absorbing / deodorizing sheet having a smooth and flexible texture can be obtained without reducing the moisture absorbing / deodorizing performance of the porous agent powder. On the other hand, if the MI value is less than 0.1, the fluidity at the time of melting is too small, and the adhesion between the sheets becomes weak. On the other hand, when the MI value exceeds 30, the melted powder hot melt agent is absorbed into the sheet-like material, causing spots such as spots on the appearance, clinging to the surface of the porous agent, and remarkably impairing moisture absorption and deodorizing performance. Result. The amount of the powder hot melt agent used is 0.5 to 2.0 times the amount of the porous agent, preferably 0.8 to 1.
5 times. If the amount of powdered hot melt agent used is less than 0.5 times the amount of porous agent, the adhesion between sheets will be weak, and if it exceeds 2.0 times, the surface of the porous agent will be covered, and moisture absorption / extinguishment will occur. It tends to impair odor performance.

The manufacturing method of the moisture absorption / deodorant sheet of this invention is demonstrated concretely.
For example, on the (C) layer surface of the laminated non-woven fabric of the present invention, each granular material of a porous agent and a hot melt agent in which a particle size is 1000 μm or less and is previously mixed with a hygroscopic agent and a deodorant is mixed with a rotating brush, vibration The powder weight is adjusted to 75 to 1500 g / m ² with a powder shaker using the like, and after coating, another non-woven fabric (D) is laminated, heated and pressurized to be bonded. As a heating method, a heater using a belt-like material such as metal or woven fabric, a metal roll, a felt drum or the like is used to heat to a temperature of 100 to 230 ° C., a pressure of 1 to 50 N / cm, and a time of 1 to 60. Bond and integrate in seconds. As another method, a mixed powder of a porous agent and a powder hot melt agent is mixed using a commonly used powder mixer such as a homomixer or a rotary mixer, and the mixed powder is mixed with, for example, an adhesive core. Using a powder shaker or the like used when manufacturing the ground, etc., uniformly spread on the layer (C) of the laminated nonwoven fabric of the present invention, to which the other laminated nonwoven fabric of the present invention is applied (C The layers are laminated so that the layers become the adhesive surfaces, followed by hot press bonding, and the hot melt agent and the constituent fibers of the layer (C) are simultaneously softened or fused to bond and integrate.

As an integration method by thermal bonding of the present invention, there is a method of heating and press-bonding between a hot press and a smooth roll to simultaneously soften or fuse the (C) layer fiber and the hot melt agent.
The heat processing temperature range is, for example, when the composite fiber having a core having a high melting point and a sheath having a low melting point is used as the (C) layer fiber, the sheath having a low melting point or higher and a core having a high melting point minus 20 ° C. is preferred.
Moisture deodorizing sheet of the laminated nonwoven fabric used basis weight of the present invention, the intensity of interest, 15~120g / ^{m 2} from breathable, preferably 20 to 100 g / ^{m 2.} If the basis weight is less than 15 g / m ² , the strength decreases. On the other hand, if it exceeds 120 g / m ² , the strength increases but the texture decreases.

The air permeability of the laminated nonwoven fabric used in the moisture absorbing / deodorizing sheet of the present invention is sufficient to exhibit its effect to the extent that powder leakage such as a porous agent to be filled does not occur. The range of 1 to 250 cc / cm ² / sec is preferable, and more preferably 5 to 200 cc / cm ² / sec. When the air permeability is less than 1 cc / cm ² / sec, air circulation is reduced, and it is desirable to maintain moisture absorption / deodorization performance, but the texture is lowered because the nonwoven fabric has a high weight per unit area. On the other hand, if it exceeds 250 cc / cm ² / sec, air circulation is sufficient, but powder leakage tends to occur. By setting the breathability of the laminated nonwoven fabric to the range of 1 to 250 cc / cm ² / sec, it is possible to suppress rapid moisture absorption / deodorization and to control the moisture absorption / deodorization rate to an appropriate rate.

Furthermore, if it is necessary to maintain moisture absorption and deodorization performance for a long time depending on the application to be used, a porous film is combined and integrated on the (A) layer side of the three-layer laminated nonwoven fabric to reduce the air permeability. Control is an effective means. In this case, as the air permeability, for example, the air permeability according to the Gurley method is preferably in the range of 1 to 10,000 seconds / 100 cc, more preferably 5 to 5000 cc / 100 cc.
As described above, the moisture absorption / deodorization sheet of the present invention has appropriate air permeability, moisture absorption / deodorization rate, depending on the intended use field of the moisture absorption / deodorization sheet and the required moisture absorption / deodorization property. The duration can be set.

Examples of the perforated film in the above case include a microporous film made of polyethylene, polypropylene, or the like, a polyester film, a film obtained by punching a uniaxial or biaxially stretched polypropylene film, or the like. Examples of the composite integration method with the laminated nonwoven fabric include thermal lamination and extrusion lamination, and preferably PET / PE extrusion lamination. In the hole-performed film, the hole diameter is 0.1 to 2 mm, and the pitch is preferably 1 to 10 mm.

  The maximum opening diameter of the laminated nonwoven fabric of the present invention is 50 μm or less, preferably 1 to 40 μm, more preferably 3 to 30 μm. When the maximum opening diameter is more than 50 μm, the fiber gap is large, so that the powder easily leaks. In particular, when the granular material is broken, the powder easily leaks.

The moisture absorption / deodorant sheet of the present invention has a basis weight of the laminated nonwoven fabric used for the surface layer of 15 g / m ² or more, a texture index of 300 or less, and since the texture is uniform, there is no thickness of the basis weight even in the micro part, By using a uniform non-woven fabric with less weight unevenness, a sheet with good printability can be obtained. Furthermore, for example, printing of laminated nonwoven fabrics with a basis weight of 30 g / m ² or less can be printed on the back side (printing on the adhesive surface). In particular, a moisture-absorbing and deodorizing sheet excellent in surface fastness can be obtained.

The present invention will be described based on examples.
The measurement method is as follows.
(1) Weight per unit area (g / m ² ): A sample having a length of 20 cm × width of 25 cm is cut out at three locations, the weight is measured, and the average value is calculated by converting it into mass per unit. (JIS-L-1906)
(2) Average fiber diameter (μm): Take a 500-fold magnified photograph with a microscope, and determine the average value of 10 fibers.
(3) Breathability: Conforms to JIS-L-1906's Frajour method and Gurley method.
(4) Formation Index Using a formation tester FMT-MIII (Nomura Shoji Co., Ltd., Patent Registration No. 1821351), four points were measured per meter in the CD direction to obtain a formation index. The smaller the value, the more uniform the texture and the less the spots.
(5) Peelability Whether to peel after processing is determined by sensory inspection.
○: Level that is difficult to peel by hand ×: Level that can be easily peeled by hand

(6) Moisture absorption retention: Calculated from the moisture absorption (Q1) of the moisture absorption / deodorant sheet and the moisture absorption (Q0) of the moisture absorbent.
Moisture absorption retention: (Q1) / (Q0) × 100 (%)
(Q1): Cut out 10 samples of 5 cm in length and 2 cm in width, put them in a weighing bottle, completely dry at 105 ° C. for 4 hours or more, and cool the sample in a desiccator for 1 hour (W1), constant temperature and constant It is calculated from the weight (W2) of the sample after being put in a wet tank (25 ° C. × 90% RH) for 24 hours, and is defined as a moisture absorption amount (Q1) converted per 1 g.
(Q1) = ((W2)-(W1)) / (W1)
(Q0): 5 g of a hygroscopic agent was placed in a weighing bottle, completely dried at 105 ° C. for 4 hours or more, cooled in an desiccator for 1 hour, weight (W3), constant temperature and humidity chamber (25 ° C. × 90%) Calculated from the weight (W4) of the sample after 24 hours in (RH) and converted to the amount of moisture absorption (Q0) per gram.
(Q0) = ((W4)-(W3)) / (W3)
(7) Moisture absorption saturation time: Cut out 10 pieces of 5 cm long x 2 cm wide samples, put them in a weighing bottle, completely dry at 105 ° C. for 4 hours or more, and cool the sample for 1 hour in a desiccator. It puts in a tank (25 degreeC x 90% RH), and measures the time which moisture absorption reaches saturation.
(8) Evaluation of deodorizing performance against bad odor gas (i) Cut out the moisture absorbing / deodorizing sheet to 5 × 10 cm.
(Ii) A sample of (i) and 600 cc of malodorous gas (hydrogen sulfide: 20 ppm) adjusted to the following concentration are sealed in a 1000 cc Tedlar bag and left in an environment of 20 ° C.
(iii) After 60 minutes, the malodorous gas concentration in the Tedlar bag is measured with a detector tube, and the malodorous gas residual ratio is calculated by the following equation.
Odor gas residual rate (%) = residual gas concentration (%) x 100 / filled gas concentration (%)

Example 1
As the C layer of the laminated nonwoven fabric, a two-component spinneret for spunbond is used, and the average fiber diameter is made of high-density polyethylene (HDPE, melting point 130 ° C) as the sheath component and polyethylene terephthalate (PET, melting point 263 ° C) as the core component. A 16 μm sheath-core type composite fiber web was prepared.
For layer B, polyethylene terephthalate (PET, melting point 263 ° C.) was used, and an ultrafine fiber web having an average fine diameter of 2 μm was discharged from a melt blown nozzle and laminated on the C layer.

Furthermore, a PET web having an average fine diameter of 14 μm was accumulated on a collection net using a polyethylene terephthalate (PET, melting point 263 ° C.) of layer A and a spunbond spunbond.
The obtained laminated fiber web having a weight per unit area of 20 g / m ² was thermocompression bonded with an embossing roll having a crimping area ratio of 25% and integrated to obtain a laminated nonwoven fabric. The obtained three-layer laminated nonwoven fabric had an air permeability of 100 cc / cm ² / sec and a formation index of 200. Next, the typeface was printed on the whole surface using the gravure printer on the C layer side of the obtained laminated nonwoven fabric.

Next, a porous agent in which coconut shell activated carbon powder classified to a particle size of 250 μm to 500 μm and B-type silica gel powder classified to a particle size of 80 μm to 200 μm are mixed at a weight ratio of 1: 4 and a melting point classified to a particle size of 250 to 500 μm. A polyethylene hot melt agent at 110 ° C. was mixed with a rotary powder mixer so that the weight ratio of the porous agent and the hot melt was 1: 1 to obtain a mixture of silica gel, activated carbon and hot melt agent powder. . Next, using a hot roll bonding type laminating apparatus equipped with a powder dispersion apparatus usually used for laminating paper and fabric, a porous agent and a hot melt are formed on the C layer of the three-layer laminated nonwoven fabric produced previously. It sprayed so that the sum total of agent powder might be 400 g / m < ² >. Furthermore, the C layer side of the same three-layer laminated nonwoven fabric was overlapped on the powder surface and joined with a hot press roll heated to 170 ° C. to obtain a moisture absorbing / deodorizing sheet.

  The properties of the obtained moisture absorption / deodorization sheet are shown in Table 1. The thickness uniformity and flexibility are excellent in moisture absorption / deodorization performance without deteriorating the moisture absorption amount of silica gel and the deodorization performance of activated carbon. It was a good moisture absorption / deodorant sheet. Furthermore, the moisture-absorbing / deodorizing sheet of the present invention was obtained in which the typefaces appeared clearly on the surface and the surface printing fastness was excellent.

(Example 2)
As the C layer of the laminated nonwoven fabric, using a spunbond two-component spinneret, an average consisting of a copolymer polyester (CO-PET, melting point 200 ° C.) as a sheath component and polyethylene terephthalate (PET, melting point 263 ° C.) as a core component A sheath-core type composite fiber web having a fine diameter of 16 μm was prepared.
For layer B, polyethylene terephthalate (PET, melting point 263 ° C.) was used, and an ultrafine fiber web having an average fine diameter of 2 μm was discharged from a melt blown nozzle and laminated on the C layer.

Furthermore, A-layer polyethylene terephthalate (PET, melting point 263 ° C.) was accumulated on the collection net as a PET web having an average fine diameter of 14 μm using a spunbond spinneret.
As a whole, the laminated fiber web having a basis weight of 20 g / m ² was integrated by thermocompression bonding with an embossing roll having a crimp area ratio of 25% to obtain a three-layer laminated nonwoven fabric. The air permeability of the obtained laminated nonwoven fabric was 100 cc / cm ² / sec, and the formation index was 200.

Next, in a B-type silica gel powder classified to a particle size of 80 μm to 200 μm, a particle size of 250 μm
A porous agent in which 10% of coconut shell activated carbon powder classified to ˜500 μm is mixed and an EVA hot melt agent having a melting point of 83 ° C. classified to a particle size of 250 to 500 μm in a weight ratio of the porous agent to the hot melt is 1: 0. Was mixed with a rotary powder mixer to obtain a mixture of porous agent and hot melt agent powder. Next, a porous material and hot-melt agent powder are formed on the layer C of the laminated nonwoven fabric previously produced using a hot roll bonding type laminating apparatus equipped with a powder spraying apparatus usually used for laminating paper and fabric. Was sprayed so that the total of 300 g / m ² . Furthermore, the C layer side of the same laminated nonwoven fabric was overlapped on the powder surface, and bonded with a hot press roll heated to 200 ° C. to obtain a moisture absorbing / deodorizing sheet. Next, the typeface was printed on the entire surface of the moisture absorbing / deodorizing sheet using a gravure printing machine. The properties of the obtained moisture absorption / deodorization sheet are shown in Table 1. The thickness of the moisture absorption / deodorization performance is excellent without reducing the moisture absorption amount of silica gel and the deodorization performance of activated carbon. It was a hygroscopic / deodorant sheet with good uniformity and flexibility.

(Example 3)
As the C layer of the laminated nonwoven fabric, a two-component spinneret for spunbond is used, and the average fiber diameter is made of high-density polyethylene (HDPE, melting point 130 ° C) as the sheath component and polyethylene terephthalate (PET, melting point 263 ° C) as the core component. A 16 μm sheath-core type composite fiber web was prepared.
As the B layer, polyethylene terephthalate (PET, melting point 263 ° C.) was used, and an ultrafine fiber web having an average fine diameter of 2 μm was discharged from the melt blown nozzle, and this was laminated on the C layer.

Furthermore, A-layer polyethylene terephthalate (PET, melting point 263 ° C.) was accumulated on the collection net as a PET web having an average fine diameter of 14 μm using a spunbond spinneret.
As a whole, a three-layer laminated fiber web having a basis weight of 70 g / m ² was integrated by thermocompression bonding with an embossing roll having a crimp area ratio of 25% to obtain a laminated nonwoven fabric. The air permeability of the obtained laminated nonwoven fabric was 9 cc / cm ² / sec, and the formation index was 91.

Next, a porous agent in which coconut shell activated carbon powder classified to a particle size of 250 μm to 500 μm and B-type silica gel powder classified to a particle size of 80 μm to 200 μm are mixed at a weight ratio of 1: 1 and a melting point classified to a particle size of 250 to 500 μm. The EVA hot melt agent at 83 ° C. was mixed with a rotary powder mixer so that the weight ratio of the porous agent to the hot melt was 1: 1 to obtain a mixture of the porous agent and the hot melt agent powder. It was. Next, using a hot roll bonding type laminating apparatus equipped with a powder spreading apparatus usually used for laminating paper and fabric, the total of the porous agent and hot melt agent powder is formed on the previously produced laminated nonwoven fabric. It sprayed so that it might become 400 g / m < ² >. Furthermore, the C layer of the same laminated nonwoven fabric with a weight per unit area of 70 g / m ² was overlapped on the powder surface, and joined with a hot press roll heated to 190 ° C. to obtain a moisture absorbing / deodorizing sheet. Next, the typeface was printed on the entire surface of the moisture absorbing / deodorizing sheet using a gravure printing machine. The properties of the obtained moisture absorption / deodorization sheet are shown in Table 1. The moisture absorption / deodorization performance is excellent without reducing the moisture absorption amount of silica gel and the deodorization performance of activated carbon. It was a good moisture absorption / deodorant sheet.

Example 4
As the C layer of the laminated nonwoven fabric, a two-component spinneret for spunbond is used, and the average fiber diameter is made of high-density polyethylene (HDPE, melting point 130 ° C) as the sheath component and polyethylene terephthalate (PET, melting point 263 ° C) as the core component. A 16 μm sheath-core type composite fiber web was prepared.
For layer B, polyethylene terephthalate (PET, melting point 263 ° C.) was used, and an ultrafine fiber web having an average fine diameter of 2 μm was discharged from a melt blown nozzle and laminated on the C layer.

Further, A-layer polyethylene terephthalate (PET, melting point 263 ° C.) was accumulated on the collection net as a PET web having an average fine diameter of 14 μm using a spunbond spinneret.
As a whole, the laminated fiber web having a basis weight of 20 g / m ² was integrated by thermocompression bonding with an embossing roll having a crimp area ratio of 25% to obtain a three-layer laminated nonwoven fabric. The air permeability of the obtained laminated nonwoven fabric was 100 cc / cm ² / sec, and the formation index was 200.

Next, a porous agent in which coconut shell activated carbon powder classified to a particle size of 250 μm to 500 μm and B-type silica gel powder classified to a particle size of 80 μm to 200 μm are mixed at a weight ratio of 1: 1 and a melting point classified to a particle size of 250 to 500 μm. The EVA hot melt agent at 83 ° C. was mixed with a rotary powder mixer so that the weight ratio of the porous agent to the hot melt was 1: 1 to obtain a mixture of the porous agent and the hot melt agent powder. It was. Next, using a hot roll bonding type laminating apparatus equipped with a powder dispersion apparatus usually used for laminating paper and fabric, the total amount of silica gel and hot melt agent powder is 200 g / g on the previously prepared laminated nonwoven fabric. It was sprayed so as to be in m ^2. Further, using a spunbond spinneret, PET webs having an average fine diameter of 14 μm made of polyethylene terephthalate (PET, melting point 263 ° C.) were accumulated on a collection net to obtain a fiber web having a basis weight of 70 g / m ² . Bonded with a hot press roll heated to 190 ° C, with a non-woven fabric (air permeability is 61 cc / cm ² / sec, texture index is 120) that is thermocompression-bonded with an embossing roll with a crimping area ratio of 25%. The moisture absorbing / deodorizing sheet of the present invention was obtained.

  The properties of the obtained moisture absorption / deodorization sheet are shown in Table 1. The thickness of the moisture absorption saturation time is long and the moisture absorption / deodorization performance is excellent without degrading the moisture absorption amount of silica gel and the deodorization performance of activated carbon. The moisture absorption sheet had good uniformity and flexibility. When the entire surface of the moisture-absorbing / deodorizing sheet was printed using a gravure printer, clear printing was possible, and the printing suitability was good.

(Example 5)
As a perforated film, polyethylene (thickness 15μ) was extruded and laminated on a polyester film (thickness 12μ) printed on the entire surface using a gravure printing machine, and then punched (hole diameter: 0.7mm, lengthwise). A sheet material in which this film and the layer A side of the laminated nonwoven fabric of Example 1 were combined and integrated by thermal lamination was obtained. The sheet material thus obtained had a Gurley air permeability of 71 seconds / 100 cc.

Next, a porous agent in which coconut shell activated carbon powder classified to a particle size of 250 μm to 500 μm and A-type silica gel powder classified to a particle size of 75 μm to 200 μm are mixed at a weight ratio of 1: 1 and a melting point classified to a particle size of 250 to 500 μm. A polyethylene hot melt agent at 110 ° C. is mixed with a rotary powder mixer so that the weight ratio of the porous agent to the hot melt is 1: 1, and a mixture of the porous agent, activated carbon, and hot melt agent powder is prepared. Obtained. Next, using a hot roll bonding type laminating apparatus equipped with a powder spraying apparatus usually used for laminating paper and fabric, silica gel and hot melt agent powder are placed on the C layer of the laminated nonwoven fabric produced previously. It sprayed so that a total might be set to 400 g / m < ² >. Further, the layer C side of the same laminated nonwoven fabric is overlapped on the powder surface and bonded with a hot press roll heated to 190 ° C., and the moisture absorption / extinguishment of the present invention in which both the front and back sides of the moisture absorption / deodorization sheet are made of films An odor sheet was obtained.

  The properties of the obtained moisture absorption / deodorization sheet are shown in Table 2. The moisture absorption / deodorization performance is excellent without reducing the moisture absorption amount of silica gel and the deodorization performance of activated carbon. It was a good moisture absorption / deodorant sheet. Furthermore, a type of moisture-absorbing sheet having a clear appearance on the surface and excellent surface fastness was obtained even in reverse printing.

(Comparative Example 1)
Using a spunbond spinneret, PET webs having an average fine diameter of 14 μm made of polyethylene terephthalate (PET, melting point 263 ° C.) are accumulated on a collection net to obtain a fiber web having a basis weight of 20 g / m ² , and then a crimping area. A nonwoven fabric was obtained by thermocompression bonding and integration with an embossing roll having a rate of 25%. The resulting nonwoven fabric has an air permeability of 316 cc / cm ² / sec and a texture index of 3
30.

Next, a porous agent in which coconut shell activated carbon powder classified to a particle size of 250 μm to 500 μm and B-type silica gel powder classified to a particle size of 80 μm to 200 μm are mixed at a weight ratio of 1: 1 and a melting point classified to a particle size of 250 to 500 μm. The EVA hot melt agent at 83 ° C. was mixed with a rotary powder mixer so that the weight ratio of the porous agent to the hot melt was 1: 1 to obtain a mixture of the porous agent and the hot melt agent powder. It was. Next, using a heat roll bonding type laminating apparatus equipped with a powder spraying apparatus usually used for laminating paper and fabric, the total amount of porous agent and hot melt agent powder is 400 g on the previously produced nonwoven fabric. / M ² was sprayed. Furthermore, the same laminated nonwoven fabric was piled up on the powder surface and joined with a hot press roll heated to 170 ° C. to obtain a moisture absorbing / deodorizing sheet. The characteristics of the obtained moisture absorbing / deodorizing sheet are shown in Table 2. The mixed powder leaks from the surface portion, and the moisture absorbing / deodorizing sheet is obtained by removing about 90% of the moisture absorbing material. Evaluation was not possible.

(Comparative Example 2)
As the C layer of the laminated nonwoven fabric, a two-component spinneret for spunbond is used, and the average fiber diameter is made of high-density polyethylene (HDPE, melting point 130 ° C) as the sheath component and polyethylene terephthalate (PET, melting point 263 ° C) as the core component. A 16 μm sheath-core type composite fiber web was prepared.
For layer B, polyethylene terephthalate (PET, melting point 263 ° C.) was used, and an ultrafine fiber web having an average fine diameter of 2 μm was discharged from a melt blown nozzle and laminated on the C layer.
Further, a PET web having an average fine diameter of 14 μm was accumulated on a collection net of polyethylene terephthalate (PET, melting point 263 ° C.) of layer A using a spunbond spunbond.

As a whole, a laminated fiber web having a basis weight of 70 g / m ² was thermocompression-bonded and integrated with an embossing roll having a crimping area ratio of 25% to obtain a laminated nonwoven fabric. The air permeability of the obtained laminated nonwoven fabric was 9 cc / cm ² / sec, and the formation index was 91. Next, a porous agent in which coconut husk activated carbon powder classified to a particle size of 250 μm to 500 μm and B type silica gel powder classified to a particle size of 80 μm to 200 μm is mixed at a weight ratio of 1: 1 is usually used for laminating paper and fabrics. Using a heat roll bonding type laminating apparatus equipped with a powder spraying apparatus, the powder of the porous agent was sprayed onto the layer C of the laminated nonwoven fabric prepared in advance so that the total amount of the powder of the porous agent was 200 g / m ² . Furthermore, layer C of the same laminated nonwoven fabric was layered on the powder surface and joined with a hot press roll heated to 190 ° C. to obtain a hygroscopic / deodorant sheet. The porous material powder not in contact with the nonwoven fabric dropped off, and a moisture absorption / deodorant sheet could not be obtained.

  Since the hygroscopic sheet of the present invention can control the air permeability in a wide range, it is mainly used for humidity control, dehumidification, and disinfection in many fields such as food-related, housing-related, pharmaceutical-related, precision equipment-related, and general merchandise-related. It can be used as a sheet for smell or drying.

Claims (11)

3 of the thermoplastic synthetic fiber layer (A), the ultrafine fiber layer (B) having an average fiber diameter of 1 to 5 μm, and the thermoplastic synthetic fiber layer (C) having a lower melting point component than the thermoplastic synthetic fiber layer (A). In the hygroscopic / deodorant sheet having a laminated nonwoven fabric layer composed of layers and another nonwoven fabric layer (D) integrated by thermal bonding on the surface of the thermoplastic synthetic fiber layer (C), the thermoplastic synthetic fiber layer (C ) And the non-woven fabric layer (D) are bonded using thermoadhesive resin particles, and the porous hygroscopic agent and the adsorbent have a particle size of 1000 μm or less. A moisture absorbing / deodorizing sheet characterized by having a structure sandwiched between a fiber layer (C) and a nonwoven fabric layer (D).   The moisture absorbent / deodorant sheet according to claim 1, wherein the other nonwoven fabric layer (D) is a nonwoven fabric layer comprising one layer or a laminated nonwoven fabric layer comprising a plurality of layers. The absolute amount of the porous agent combined with the porous moisture absorbent and the adsorbent is 50 to 1000 g / m ² , and the absolute amount of the adsorbent to be mixed is 10 to 500 g / m ^2. Item 3. The moisture absorbing / deodorizing sheet according to Item 1 or 2. Any of claim 1, wherein the mixing ratio of the porous agent a combination of the adsorbent and the porous moisture absorbent for said thermal adhesive resin particles is in the range of 1/2 to 2/1 in weight ratio Moisture absorbing / deodorizing sheet according to crab. The moisture absorption / deodorant sheet according to any one of claims 1 to 4, wherein the laminated nonwoven fabric comprising the three layers (A) to (C) has a breathability of 1 to 250 cc / cm ² · sec. .   The moisture-absorbing / deodorizing sheet according to any one of claims 1 to 5, wherein the thermal adhesive resin particles are a hot melt agent, the porous moisture absorbent is silica gel, and the adsorbent is activated carbon.   The hygroscopic / deodorant sheet according to any one of claims 1 to 6, further comprising a printed layer on a front surface and / or a back surface of the laminated nonwoven fabric including the three layers (A) to (C).   A hygroscopic / deodorant sheet according to any one of claims 1 to 7, wherein a perforated film is combined and integrated on at least one surface of the laminated nonwoven fabric composed of the three layers (A) to (C). .   The moisture absorption and deodorization according to claim 8, wherein the air permeability of the laminated nonwoven fabric composed of three layers (A) to (C) in which the perforated film is combined and integrated is 1 to 10000 seconds / 100 cc. Sheet. A multilayer moisture-absorbing / deodorizing sheet, wherein a plurality of sheets are laminated by interposing a heat-adhesive resin layer in the moisture-absorbing / deodorizing sheet according to claim 1 .   A laminated nonwoven fabric layer comprising three layers of a thermoplastic synthetic fiber layer (A), an ultrafine fiber layer (B), and a thermoplastic synthetic fiber layer (C) having a lower melting point component than the thermoplastic synthetic fiber layer (A) is formed. Then, on the surface of the thermoplastic synthetic fiber layer (C), thermal adhesive resin particles having a particle size of 1000 μm or less, a porous moisture absorbent and an adsorbent are sprayed, and the other nonwoven fabric layer (D) is further dispersed in the heat The hygroscopic / deodorant according to claim 1, wherein the porous hygroscopic agent and the adsorbent are sandwiched between the nonwoven fabric layers by thermally bonding on the surface of the plastic synthetic fiber layer (C) and laminating and integrating them. Sheet manufacturing method.